Has anyone changed the seals on there steering box or should i look for a new unit? Also i have a rumble from the rear diff but only does it in a straight line stops when cornering
i am going to change the oil and put something extra in with the oil ? has anyone got any thoughts.

just change the diff oil and see if the noise stops mate might be old or low oil.

Steering box I would not bother changing the seals its the shaft that becomes pitted and leaks and will mess up new seals

mine has leaked since owning the truck 3 or 4 years now

Stick some lucas power steering stop leak in it take as much normal fluid out with a suction gun or turkey baster and fill back up with the wyns it has slowed mine right down still leaks but barley

hello matey
changing the front,rear diff oils and the gearbox and transfer box too is always a good shout

I bought a reconditioned unit from these people a couple years back, good service and had no problems since.

http://www.kellybraysteering.co.uk/